Future HEP Accelerators: The US Perspective

TL;DR

This paper reviews the current and future landscape of high energy physics accelerators, focusing on post-LHC options for energy and intensity frontier research globally, highlighting proposed facilities and strategic directions.

Contribution

It provides a comprehensive overview of proposed next-generation accelerator facilities and strategic plans for future high energy physics research beyond the LHC.

Findings

Analysis of post-LHC energy frontier collider options

Overview of future intensity frontier accelerator proposals

Assessment of global strategic directions in HEP accelerators

Abstract

Accelerator technology has advanced tremendously since the introduction of accelerators in the 1930s, and particle accelerators have become indispensable instruments in high energy physics (HEP) research to probe Nature at smaller and smaller distances. At present, accelerator facilities can be classified into Energy Frontier colliders that enable direct discoveries and studies of high mass scale particles and Intensity Frontier accelerators for exploration of extremely rare processes, usually at relatively low energies. The near term strategies of the global energy frontier particle physics community are centered on fully exploiting the physics potential of the Large Hadron Collider (LHC) at CERN through its high-luminosity upgrade (HL-LHC), while the intensity frontier HEP research is focused on studies of neutrinos at the MW-scale beam power accelerator facilities, such as Fermilab Main Injector with the planned PIP-II SRF linac project. A number of next generation accelerator facilities have been proposed and are currently under consideration for the medium- and long-term future programs of accelerator-based HEP research. In this paper, we briefly review the post-LHC energy frontier options, both for lepton and hadron colliders in various regions of the world, as well as possible future intensity frontier accelerator facilities.